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Remove an entire column from a data.frame in R
...can take an unusually long amount of time and/or fail due to out of memory errors. Package data.table helps address this problem with the := operator:
library(data.table)
> dt <- data.table(a = 1, b = 1, c = 1)
> dt[,a:=NULL]
b c
[1,] 1 1
I should put together a bigger example to sh...
How can I check for an empty/undefined/null string in JavaScript?
...ant value and the variable. This way when you test your code you'll see an error (Invalid lef-hand side in assignment). You can also use something like JSHint to disallow assignment in conditions and be warned when you write one.
– florian
Sep 23 '13 at 9:58
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How to add directory to classpath in an application run profile in IntelliJ IDEA?
... the classes folder. Intellij should be able to load it.
You will get this error if "Project Compiler output" is blank.
Just make sure that below value is set:
Filter dict to contain only certain keys?
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Throws a KeyError if one of the filer keys is not present in old_dict. I would suggest {k:d[k] for k in filter if k in d}
– Peter Gibson
Jun 28 '12 at 1:53
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How to combine date from one field with time from another field - MS SQL Server
...get The data types datetime and time are incompatible in the add operator. error on SQL Server 2012
– Devin Prejean
May 18 '16 at 15:45
4
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How do I simulate a low bandwidth, high latency environment?
...hat's true. You can only add Latency and a couple of other network related errors.
This will disqualify this answer as a valid answer to the question, however since I had good use for it when I wanted to simulate a bad network so I'll leave it here as long as it has > 0 votes or similar.
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How to serialize Joda DateTime with Jackson JSON processor?
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when I add that I get the compile error "incompatible types: JodaModule cannot be converted to Module" - the method expects a org.codehaus.jackson.map.Module but JodaModule does not have this in its heirarchy so how could this work?
– Ma...
Download File to server from URL
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How do you handle errors with this approach? What if a 404 is returned or the connection is interrupted or times out?
– Adam Swinden
Dec 29 '14 at 11:33
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Convert a Map to a POJO
...ctory().constructType(t));
} catch (Exception e) {
log.error("converting failed! aMap: {}, class: {}", getJsonString(aMap), t.getClass().getSimpleName(), e);
}
return null;
}
share
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Viewing unpushed Git commits
...did it for me - for some reason git log origin.. by itself was throwing an error. Looks like I also had a problem with the way my local branch was configured - once I made the changes I found here: wincent.com/blog/… …the problem was resolved, and I could use git status again to see what I wan...